Recent answers to How do I fix Secure Connection Failed when trying to connect to my network attached printer?https://support.mozilla.org/az/questions/9599152013-05-20T20:23:39-07:00Yes, adding an exception for specific certificate errors can be difficult, especially with reused se2013-05-20T20:23:39-07:00cor-elhttps://support.mozilla.org/az/questions/959915#answer-438288

Yes, adding an exception for specific certificate errors can be difficult, especially with reused serial numbers.
It should normally work if you remove the conflicting certificate.

Thanks, Cor-el. I had read that article and followed those instructions to delete the original cert2013-05-20T19:41:20-07:00arvesperhttps://support.mozilla.org/az/questions/959915#answer-438273

Thanks, Cor-el. I had read that article and followed those instructions to delete the original certificate, but was unable to add the exception after that...

See also:
https://support.mozilla.org/kb/Certificate+contains+the+same+serial+number+as+another+cer2013-05-20T19:36:42-07:00cor-elhttps://support.mozilla.org/az/questions/959915#answer-438270

your welcome man have a nice day and if you need anything more just ask
2013-05-20T19:25:28-07:00firefoxman1462https://support.mozilla.org/az/questions/959915#answer-438264

your welcome man have a nice day and if you need anything more just ask

I was absolutely convinced that this would have no effect, but I poked the reset button on my router2013-05-20T19:23:22-07:00arvesperhttps://support.mozilla.org/az/questions/959915#answer-438261

I was absolutely convinced that this would have no effect, but I poked the reset button on my router and when the network came back up I was able to add a permanent exception for the printer. Thanks!!! (I should mention that I deleted the certificate for the printer before I did that (tools/options/Advanced/Encryption/View Certificates))

i see its a connection issue with your computer and printer try resetting your internet then try aga2013-05-20T19:07:18-07:00firefoxman1462https://support.mozilla.org/az/questions/959915#answer-438253

i see its a connection issue with your computer and printer try resetting your internet then try again